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But it wasn't until a trip to Disneyland in 2012, when the unexpected side-affect was revealed.

Mr Cernik, who was scared of heights, decided to sit on a rollercoaster that would have terrified him before and realised that he felt nothing.

At first he thought it was a fluke but in the years since he has dived out of a plane at 17,000ft and abseiled down a 418ft tower and felt no fear.

Mr Cernik pictured abseiling down a 418ft tower in one of the many challenges he has done

Mr Cernik, pictured with sled-pulling dogs, first noticed he was no longer scared of heights when he went on a rollercoaster at Disneyland

Mr Cernik suffers from ultra-rare Cushing's syndrome which causes high levels of the hormone Cortisol, which led to rapid weight gain (right)

GLANDS GIVE 'FIGHT OR FLIGHT' BOOST

The adrenal glands produce adrenaline, which triggers the body's 'fight or flight' response.

The adrenaline prompts a massive glucose boost that offers a sudden and short-term energy boost.

The effects include an increase in heart rate and blood pressure, air passages in the lungs expanding, and blood being pumped to the muscles.

It can massively boost physical performance, but also leads to a nervous feeling.

Early humans would have needed the boost to either fight off attacking predators or run away, or 'fight or flight,' response.

Even as he dangled his legs over the edge of the Tyne Bridge - 84ft above the water - before sliding down a zip wire to the Gateshead side, he did not feel scared.

Speaking about his 'superhero' symptoms, he said: 'No-one really knows how I have come to feel no fear because you can't see it.

'The no fear card I have been dealt is a combination of the fact that my adrenal glands have been removed and that I've had so many procedures done which resulted in complications.

'It means that when I'm standing on top of a tower or about to jump I know I should feel fear, but the message is just not getting through from my brain.'

However, Mr Cernic labels the feat as a 'double-edged sword' because he also struggles with motivation and drive.

The former Territorial Army recruit (pictured) believes he can trace his symptoms back to 2005 but didn't have the operations until 2010

In just three years 5ft 8in Jordy ballooned from 11st 5lb to almost 17st (pictured)

WHAT IS CUSHING'S SYNDROME?

Mr Cernik's symptoms were caused by Cushing’s syndrome — a condition that affects around a million Britons.

The pituitary gland at the base of Jordy’s brain was making too much of a hormone called adrenocorticotropic hormone (ACTH).

This was stimulating the adrenal glands, which sit above the kidneys, to produce too much of the hormone cortisol; excessive amounts lead to an unusual type of obesity, where fat is laid down around the trunk, but not on the arms and legs.

The face also becomes puffy and red.

He also has to take 30 pills a day, a cocktail of painkillers and hormones, plus drugs to slow the corrosion of his bones.

Mr Cernik, from Jarrow, Tyne and Wear, said: 'Sometimes I just do not have that get up and go and I cannot even go and watch my daughter in her school play.

'My "weaknesses" so to speak have rarely been reported but feeling no fear does come with a heavy price. I wouldn't recommend it.

'It's the amount of pills and my real lack of motivation which was once the main thing I had as a fleeting TV Presenter to really give me that motivation.

'Losing my drive was a big blow, and as a freelance radio producer I have to put almost triple the amount of energy into doing things than the normal person.'

Mr Cernik is trying to spread awareness, to learn more about his message visit his justgiving page.